Waste and Recycling Notes Waste Disposal

1
Waste and Recycling Notes Waste Disposal

• Read Miller, page 532.

2
Chapter Overview Questions

• What is solid waste and how much do we produce?
• How can we produce less solid waste?
• What are the advantages and disadvantages of
  reusing recycled materials?
• What are the advantages and disadvantages of
  burning or burying solid waste?
• What is hazardous waste and how can we deal with
  it?

3
Chapter Overview Questions (contd)

• What can we do to reduce exposure to lead and
  mercury?
• How can we make the transition to a more
  sustainable low-waste society?

4
Core Case Study Love Canal There Is No Away

• Between 1842-1953, Hooker Chemical sealed
  multiple chemical wastes into steel drums and
  dumped them into an old canal excavation (Love
  Canal).
• In 1953, the canal was filled and sold to Niagara
  Falls school board for 1.
• The company inserted a disclaimer denying
  liability for the wastes.

5
Core Case Study Love Canal There Is No Away

• In 1957, Hooker Chemical warned the school not to
  disturb the site because of the toxic waste.
• In 1959 an elementary school, playing fields and
  homes were built disrupting the clay cap covering
  the wastes.
• In 1976, residents complained of chemical smells
  and chemical burns from the site.

6
Core Case Study Love Canal There Is No Away

• President Jimmy Carter declared Love Canal a
  federal disaster area.
• The area was abandoned in 1980 (left).

Figure 22-1
7
Core Case Study Love Canal There Is No Away

• It still is a controversy as to how much the
  chemicals at Love Canal injured or caused disease
  to the residents.
• Love Canal sparked creation of the Superfund law,
  which forced polluters to pay for cleaning up
  abandoned toxic waste dumps.

8
WASTING RESOURCES

• Solid waste any unwanted or discarded material
  we produce that is not a liquid or gas.
• Municipal solid waste (MSW) produce directly
  from homes.
• Industrial solid waste produced indirectly by
  industries that supply people with goods and
  services.
• Hazardous (toxic) waste threatens human health
  or the environment because it is toxic,
  chemically active, corrosive or flammable.

9
WASTING RESOURCES

• Solid wastes polluting a river in Jakarta,
  Indonesia. The man in the boat is looking for
  items to salvage or sell.

Figure 22-3
10
WASTING RESOURCES

• The United States produces about a third of the
  worlds solid waste and buries more than half of
  it in landfills.
• About 98.5 is industrial solid waste.
• The remaining 1.5 is MSW.
• About 55 of U.S. MSW is dumped into landfills,
  30 is recycled or composted, and 15 is burned
  in incinerators.

11
Electronic Waste A Growing Problem

• E-waste consists of toxic and hazardous waste
  such as PVC, lead, mercury, and cadmium.
• The U.S. produces almost half of the world's
  e-waste but only recycles about 10 of it.

Figure 22-4
12
Definition
Landfills

• Solid waste is placed in a hole, compacted, and
  covered with soil.
• Reduces the number of rats associated with solid
  waste, lessens the danger of fire, and decreases
  the odor.

13
Current Criteria

• Landfills cannot pollute surface or groundwater.
• Compacted clay and plastic sheets are at the
  bottom (prevents liquid waste from seeping into
  groundwater)
• A double liner system must be present (plastic,
  clay, plastic, clay), and a system to collect
  leachate (liquid that seeps through the solid
  waste)

14
Oil

• Not allowed
• Must go to an automotive or environmental company
  for recycling.

15
Tires

• Are usually allowed if they are quartered or
  shredded.

16
Antifreeze

• Not allowed.
• Must be sent to an automotive or environmental
  company for recycling.

17
Air Conditioner Coolants

• Not allowed
• Must be sent to an automotive or environmental
  company for recycling.

18
Lead Acid (Car Batteries)

• Not allowed
• Must be sent to an automotive or an environmental
  company for recycling.

19
Definition
Composts

• A sweet-smelling, dark-brown, humus-like material
  that is rich in organic material and soil
  nutrients.

20
Benefits

• Aerates the soil.
• Improves soils ability to retain water and
  nutrients.
• Helps prevent erosion.
• Prevents nutrients from being dumped in landfills.

21
Needs

• 6 to 12 inches of grass clippings
• leaves or other plant material
• shade
• garden fertilizer or manure
• soil
• water
• air

22
Definition
Recycling

• Conservation of resources by converting them into
  new product.

23
Organic

• Comprise over 1/2 of the solid waste
• Includes yard debris, wood materials, bio-solids,
  food, manure and agricultural residues, land
  clearing debris, used paper, and mixed municipal
  organic waste.
• Organic materials have been dumped in landfills
  or burned. Why not use them!

24
General Purpose

• Recycling saves land, reduces the amount of solid
  waste, energy consumption and pollution.
• Ex. recycling one aluminum can saves the energy
  of about 6 oz. of gasoline.

25
Examples

• Gold, lead, nickel, steel, copper, silver, zinc,
  and aluminum are recyclable.

26
Problems

• Recycling does have environmental costs.
• It uses energy and generates pollution.
• Ex. the de-inking process in paper recycling
  requires energy, and produces a toxic sludge that
  contains heavy metals.

27
Benefits

• Conserves our natural resources
• Has a positive effect on the economy by
  generating jobs and revenues.
• For example, the Sunday edition of the New York
  Times consumes 62,000 trees.
• Currently, only about 20 of all paper in North
  America is recycled.

28
Specific Recycled Items
29
Glass

• U.S. recycles about 36 of its glass containers.
  
• It costs less to recycle glass than to make new
  glass.
• Mixed color glass cullet is used for
  glassphalt, a glass/asphalt mixture.

30
Aluminum

• This is the most recycled material in the U.S.
  because of .
• Making a new can from an old one requires a
  fraction of the energy than to make a new can
  from raw materials.
• Approximately 2/3 of cans are recycled each year,
  saving 19 million barrels of oil annually.

31
Paper

• U.S. currently recycles 40 of its paper and
  paperboard.
• Denmark, recycles about 97 of its paper.
• Many U.S. mills are not able to process waste
  paper.
• Many countries like Mexico, import a large amount
  of wastepaper from the U.S.
• We export about 19 of our recycled paper.

32
Recyclable Plastics
33
1 - PET (Polyethylene terephthalate)

• PET is used to make soft drink bottles, peanut
  butter jars, etc.
• PET can be recycled into fiberfill for sleeping
  bags, carpet fibers, rope, and pillows.

34
2 - HDPE (High-density polyethylene)

• HDPE is found in milk jugs, butter tubs,
  detergent bottles, and motor oil bottles.
• HDPE can be recycled into flowerpots, trashcans,
  traffic barrier cones, and detergent bottles.

35
3 - PVC (Polyvinyl chloride)

• PVC is used in shampoo and cooking oil bottles
  fast-food service items.

36
4 - LDPE (Low-density polyethylene)

• LDPE is found in grocery bags, bread bags,
  shrink-wrap, and margarine tub tops.
• LDPE can be recycled into new grocery bags.

37
5 - PP (Polypropylene)

• PP is used in yogurt containers, straws, pancake
  syrup bottles, and bottle caps.
• PP can be recycled into plastic lumber, car
  battery cases, and manhole steps.

38
6 - PS (Polystyrene)

• PS is found in disposable hot cups, packaging
  materials (peanuts), meat trays.
• PS can be recycled into plastic lumber, cassette
  tape boxes, and flowerpots.

39
7 - Other

• A mixture of various plastics, like squeeze
  ketchup bottles microwaveable dishes.

40
Nuclear Waste

• The safe disposal of radioactive wastes is the
  problem.
• Radioactive wastes must be stored in an isolated
  area where they cant contaminate the
  environment.
• It must have geological stability and little or
  no water flowing nearby.

41
Texas Production of Waste

• The TNRCC oversees the municipal waste in Texas.
  
• In 1998, the solid waste disposal rate for Texans
  was 6.5 pounds per person per day.
• This is based on every item that goes into a
  landfill.
• The TNRCC estimates that 12,740,234 tons were
  diverted for recycling in 1998.
• Texans disposal rate is comparable to the US
  disposal rate.

42
Packaging

• Many packaging items are put into landfills,
  including boxes, packing peanuts, Styrofoam,
  shrink wrap, etc.
• Try to buy things that are not as highly
  packaged.
• Many companies use peanuts that are made from
  cellulose that can be washed down the drain and
  not put into landfills.
• Reuse containers and buy smart!

43
Definition
Integrated Waste Management

• The most effective way to deal with solid and
  hazardous waste and hazardous waste.
• This includes the three Rs reduce, reuse, and
  recycle.

44
INTEGRATED WASTE MANAGEMENT

• We can manage the solid wastes we produce and
  reduce or prevent their production.

Figure 22-5
45

Second Priority
Last Priority
First Priority
Primary Pollution and Waste Prevention
Waste Management
Secondary Pollution and Waste Prevention
Treat waste to reduce toxicity
Change industrial process to eliminate
use of harmful chemicals
Reuse products
Repair products
Incinerate waste
Bury waste in landfills
Recycle
Purchase different products
Compost
Release waste into environment for
dispersal or dilution
Buy reusable recyclable products
Use less of a harmful product
Reduce packaging and materials in products
Make products that last longer and are
recyclable, reusable, or easy to repair
Fig. 22-5, p. 523
46
Solutions Reducing Solid Waste

• Refuse to buy items that we really dont need.
• Reduce consume less and live a simpler and less
  stressful life by practicing simplicity.
• Reuse rely more on items that can be used over
  and over.
• Repurpose use something for another purpose
  instead of throwing it away.
• Recycle paper, glass, cans, plasticsand buy
  items made from recycled materials.

47

What Can You Do?
Solid Waste

• Follow the five Rs of resource use Refuse,
  Reduce,
• Reuse, Repurpose, and Recycle.

Ask yourself whether you really need a
particular item.
Rent, borrow, or barter goods and services when
you can.
Buy things that are reusable, recyclable, or
compostable, and be sure to reuse, recycle, and
compost them.
Do not use throwaway paper and plastic plates,
cups and eating utensils, and other disposable
items when reusable or refillable versions are
available.
Refill and reuse a bottled water container with
tap water.
Use e-mail in place of conventional paper mail.
Read newspapers and magazines online.
Buy products in concentrated form whenever
possible.
Fig. 22-6, p. 524
48
REUSE

• Reusing products is an important way to reduce
  resource use, waste, and pollution in developed
  countries.
• Reusing can be hazardous in developing countries
  for poor who scavenge in open dumps.
• They can be exposed to toxins or infectious
  diseases.

49
RECYCLING

• Primary (closed loop) recycling materials are
  turned into new products of the same type.
• Secondary recycling materials are converted into
  different products.
• Used tires shredded and converted into rubberized
  road surface.
• Newspapers transformed into cellulose insulation.

50
RECYCLING

• Composting biodegradable organic waste mimics
  nature by recycling plant nutrients to the soil.
• Recycling paper has a number of environmental
  (reduction in pollution and deforestation, less
  energy expenditure) and economic benefits and is
  easy to do.

51
RECYCLING

• Recycling many plastics is chemically and
  economically difficult.
• Many plastics are hard to isolate from other
  wastes.
• Recovering individual plastic resins does not
  yield much material.
• The cost of virgin plastic resins in low than
  recycled resins due to low fossil fuel costs.
• There are new technologies that are making
  plastics biodegradable.

52
BURNING AND BURYING SOLID WASTE

• Globally, MSW is burned in over 1,000 large
  waste-to-energy incinerators, which boil water to
  make steam for heating water, or space, or for
  production of electricity.
• Japan and a few European countries incinerate
  most of their MSW.

53
Waste-to-Energy Incineration

• 1) the volume of waste is reduced by up to 90
  and 2) the heat produced, produces steam, which
  can warm buildings or generate electricity.
• In 1999, the U.S. had 110 w-to-e incinerators,
  which burned 16 of the nations solid waste
  produces less CO2 emissions than power plants
  that run on fossil fuels. Giant piles of tires
  are also being burned to supply electricity.

54
Burning Solid Waste

• Waste-to-energy incinerator with pollution
  controls that burns mixed solid waste.

Figure 22-10
55
Burying Solid Waste

• Most of the worlds MSW is buried in landfills
  that eventually are expected to leak toxic
  liquids into the soil and underlying aquifers.
• Open dumps are fields or holes in the ground
  where garbage is deposited and sometimes covered
  with soil. Mostly used in developing countries.
• Sanitary landfills solid wastes are spread out
  in thin layers, compacted and covered daily with
  a fresh layer of clay or plastic foam.

56

When landfill is full, layers of soil and
clay seal in trash
Topsoil
Electricity generator building
Sand
Clay
Methane storage and compressor building
Leachate treatment system
Garbage
Probes to detect methane leaks
Pipes collect explosive methane as used as fuel
to generate electricity
Methane gas recovery well
Leachate storage tank
Compacted solid waste
Groundwater monitoring well
Garbage
Leachate pipes
Leachate pumped up to storage tank for safe
disposal
Sand
Synthetic liner
Leachate monitoring well
Sand
Groundwater
Clay and plastic lining to prevent leaks
pipes collect leachate from bottom of landfill
Clay
Subsoil
Fig. 22-12, p. 532
57
Case Study What Should We Do with Used Tires?

• We face a dilemma in deciding what to so with
  hundreds of millions of discarded tires.

Figure 22-14
58
HAZARDOUS WASTE

• Hazardous waste is any discarded solid or liquid
  material that is toxic, ignitable, corrosive, or
  reactive enough to explode or release toxic
  fumes.
• The two largest classes of hazardous wastes are
  organic compounds (e.g. pesticides, PCBs,
  dioxins) and toxic heavy metals (e.g. lead,
  mercury, arsenic).

59
Hazardous Waste Regulations in the United States

• Two major federal laws regulate the management
  and disposal of hazardous waste in the U.S.
• Resource Conservation and Recovery Act (RCRA)
• Cradle-to-the-grave system to keep track waste.
• Comprehensive Environmental Response,
  Compensation, and Liability Act (CERCLA)
• Commonly known as Superfund program.

60
Hazardous Waste Regulations in the United States

• The Superfund law was designed to have polluters
  pay for cleaning up abandoned hazardous waste
  sites.
• Only 70 of the cleanup costs have come from the
  polluters, the rest comes from a trust fund
  financed until 1995 by taxes on chemical raw
  materials and oil.

61
Conversion to Less Hazardous Substances

• Physical Methods using charcoal or resins to
  separate out harmful chemicals.
• Chemical Methods using chemical reactions that
  can convert hazardous chemicals to less harmful
  or harmless chemicals.

62
Conversion to Less Hazardous Substances

• Biological Methods
• Bioremediation bacteria or enzymes help destroy
  toxic and hazardous waste or convert them to more
  benign substances.
• Phytoremediation involves using natural or
  genetically engineered plants to absorb, filter
  and remove contaminants from polluted soil and
  water.

63

Inorganic metal contaminants
Organic contaminants
Radioactive contaminants
Poplar tree
Brake fern
Willow tree
Sunflower
Indian mustard
Landfill
Oil spill
Polluted groundwater in
Polluted leachate
Decontaminated water out
Soil
Soil
Groundwater
Groundwater
Phytodegradation Plants such as poplars can
absorb toxic organic chemicals and break them
down into less harmful compounds which they
store or release slowly into the air.
Rhizofiltration Roots of plants such as
sunflowers with dangling roots on ponds or in
green- houses can absorb pollutants such as
radioactive strontium-90 and cesium-137 and
various organic chemicals.
Phytoextraction Roots of plants such as Indian
mustard and brake ferns can absorb toxic metals
such as lead, arsenic, and others and store
them in their leaves. Plants can then be
recycled or harvested and incinerated.
Phytostabilization Plants such as willow trees
and poplars can absorb chemicals and keep them
from reaching groundwater or nearby surface water.
64
Conversion to Less Hazardous Substances

• Incineration heating many types of hazardous
  waste to high temperatures up to 2000 C in
  an incinerator can break them down and convert
  them to less harmful or harmless chemicals.

65
Conversion to Less Hazardous Substances

• Plasma Torch passing electrical current through
  gas to generate an electric arc and very high
  temperatures can create plasma.
• The plasma process can be carried out in a torch
  which can decompose liquid or solid hazardous
  organic material.

66
Long-Term Storage of Hazardous Waste

• Hazardous waste can be disposed of on or
  underneath the earths surface, but without
  proper design and care this can pollute the air
  and water.
• Deep-well disposal liquid hazardous wastes are
  pumped under pressure into dry porous rock far
  beneath aquifers.
• Surface impoundments excavated depressions such
  as ponds, pits, or lagoons into which liners are
  placed and liquid hazardous wastes are stored.

67
Long-Term Storage of Hazardous Waste

• Long-Term Retrievable Storage Some highly toxic
  materials cannot be detoxified or destroyed.
  Metal drums are used to stored them in areas that
  can be inspected and retrieved.
• Secure Landfills Sometimes hazardous waste are
  put into drums and buried in carefully designed
  and monitored sites.

68
Secure Hazardous Waste Landfill

• In the U.S. there are only 23 commercial
  hazardous waste landfills.

Figure 22-22
69
ACHIEVING A LOW-WASTE SOCIETY

• In the U.S., citizens have kept large numbers of
  incinerators, landfills, and hazardous waste
  treatment plants from being built in their local
  areas.
• Environmental justice means that everyone is
  entitled to protection from environmental hazards
  without discrimination.

70
Global Outlook International Action to Reduce
Hazardous Waste

• An international treaty calls for phasing out the
  use of harmful persistent organic pollutants
  (POPs).
• POPs are insoluble in water and soluble in fat.
• Nearly every person on earth has detectable
  levels of POPs in their blood.
• The U.S has not ratified this treaty.

71
Making the Transition to a Low-Waste Society A
New Vision

• Everything is connected.
• There is no away for the wastes we produce.
• Dilution is not always the solution to pollution.
• The best and cheapest way to deal with wastes are
  reduction and pollution prevention.